力扣刷题771.宝石与石头

class Solution {
    public int numJewelsInStones(String jewels, String stones) {
        Set<Character> set1 = new HashSet<Character>();
        for(int i=0;i<jewels.length();i++){
            set1.add(jewels.charAt(i));
        }
        int result = 0;
        for(int j=0; j<stones.length(); j++){
            if(set1.contains(stones.charAt(j))){
                result++;
            }
        }
        return result;
    }
}

与349寻找两个数组的交集，思路一致。